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Because I couldn't compile a cpp code with using

#include  "opencv2/text.hpp

in .cpp file I noticed I probably have not linked and correctly set OpenCV libraries from extra modules.

Ok, so I tried instructions here here. I opened terminal and entered

cmake -DOPENCV_EXTRA_MODULES_PATH=/home/user/openc/opencv_contrib/modules /home/user/openc/opencv

but I got a

CMake Error at CMakeLists.txt:11 (message):
Manually-specified variables were not used by the project:

  OPENCV_EXTRA_MODULES_PATH

-- Configuring incomplete, errors occurred!

Could anybody please help me with setting OpenCV extra modules correctly?

I have tried CMake-gui but that have a lot more errors after processing configure.

Also I have tried force copy library module folder in /usr/local/include/opencv2, where basic modules are. But I got make errors with undefined references, for example like:

 undefined reference to `cv::text::computeNMChannels(cv::_InputArray const&, cv::_OutputArray const&, int)' " ).
Tsyvarev
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Lukáš Vojtek
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  • What OpenCV version are you trying to build? – w-m Jul 25 '18 at 14:37
  • Well I have istalled OpenCV version 3.4.1 (seen from headers). – Lukáš Vojtek Jul 25 '18 at 15:49
  • Have you tried a clean build? Wondering if files from the previous build is causing errors while using making. – pragmaticprog Jul 25 '18 at 20:02
  • Well, I have tried to install openCV two times again to another folders to make sure for clean build and now I finally make it > Configured. Generated. But. Another Issues occured on the next step in 'make -j7' process. I typed it in a new topic here: https://stackoverflow.com/questions/51558932/unable-to-complete-make-j7-with-opencv-contrib-modules – Lukáš Vojtek Jul 27 '18 at 13:29

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